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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad1754efeb02e9ab7feb227a7dd69bdd0ab756cb63335f1732607ed56ffb5a0a' 
  AND token = 'C5M4O0QwFHkp9j1U3iuGH/tstR+gLp0pIN9efGEV88Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}